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Unix Version 7 - man page for mail (v7 section 1)

MAIL(1) 			     General Commands Manual				  MAIL(1)

       mail  -	send or receive mail among users

       mail person ...
       mail [ -r ] [ -q ] [ -p ] [ -f file ]

       Mail  with  no  argument  prints  a user's mail, message-by-message, in last-in, first-out
       order; the optional argument -r causes first-in, first-out  order.   If	the  -p  flag  is
       given,  the  mail  is  printed  with no questions asked; otherwise, for each message, mail
       reads a line from the standard input to direct disposition of the message.

	      Go on to next message.

       d      Delete message and go on to the next.

       p      Print message again.

       -      Go back to previous message.

       s [ file ] ...
	      Save the message in the named files (`mbox' default).

       w [ file ] ...
	      Save the message, without a header, in the named files (`mbox' default).

       m [ person ] ...
	      Mail the message to the named persons (yourself is default).

       EOT (control-D)
	      Put unexamined mail back in the mailbox and stop.

       q      Same as EOT.

       x      Exit, without changing the mailbox file.

	      Escape to the Shell to do command.

       ?      Print a command summary.

       An interrupt stops the printing of the current letter.  The optional  argument  -q  causes
       mail to exit after interrupts without changing the mailbox.

       When persons are named, mail takes the standard input up to an end-of-file (or a line with
       just `.')  and adds it to each person's `mail' file.   The  message  is	preceded  by  the
       sender's  name  and a postmark.	Lines that look like postmarks are prepended with `>'.	A
       person is usually a user name recognized by login(1).  To denote a recipient on	a  remote
       system, prefix person by the system name and exclamation mark (see uucp(1)).

       The  -f	option	causes	the named file, e.g. `mbox', to be printed as if it were the mail

       Each user owns his own mailbox, which is by default generally readable but  not	writable.
       The  command  does  not delete an empty mailbox nor change its mode, so a user may make it
       unreadable if desired.

       When a user logs in he is informed of the presence of mail.

       /usr/spool/mail/*   mailboxes
       /etc/passwd    to identify sender and locate persons
       mbox	 saved mail
       /tmp/ma*  temp file
       dead.letter    unmailable text

       xsend(1), write(1), uucp(1)

       There is a locking mechanism intended to prevent two senders from accessing the same mail-
       box, but it is not perfect and races are possible.


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